
<div class="row">
    <div class="col">
        <label><input type="radio" name="pay_type" value="1" ng-model="order.pay_type" ng-checked="true"><span>微信支付</span></label>
    </div>
    <div class="col">
        <label><input type="radio" name="pay_type" value="2" ng-model="order.pay_type"><span>余额支付</span></label>
    </div>
</div>
<style>
    .row .col label{width: 100%;}
    .row .col input{text-align: center;width: 100%;}

    .row .col span{display: block;text-align: center;}
</style>